div{
	margin:10px;
	padding: 5px;
}
#then{
	border:1px solid mediumorchid;
	
}
.layer01{
	border: 1px blue dashed;
	float: left
	/* float: right; */
	/* clear: both; */
	/* clear: left; */
}
.layer02{
	border: 1px green dashed;
	float: left;
	/* clear: left; */
	/* float: right; */
	/* clear: both; */
}
.layer03{
	border: 1px gray dashed;
	/* clear: both; */
	/* float: left; */
	float: right;
	}
.aa{
		border: 1px red dashed;
		font-size: 12px;
		line-height: 23px;
		width: 200px;
		float: left;
	}
/* .clear{
	clear: both;
	margin: 0;
	padding: 0;
} */
/* #father{
	border: 1px gray dashed;
	height: 100px;
	overflow: auto;
} */
#then:after{
	content: "";
	display: block;
	clear: both;
}